The energy of a photon is directly proportional to its frequency and inversely proportional to its wavelength, according to the equation E = hν, where E is the energy, h is Planck's constant (approximately 6.626 x 10^-34 joule-seconds), and ν is the frequency of the photon.
Therefore, the photon with the greatest amount of energy corresponds to the highest frequency. According to the electromagnetic spectrum, the highest frequency photons are found in the gamma-ray region. Gamma rays have wavelengths shorter than 10 picometers (pm), which corresponds to frequencies greater than 3 x 10^19 hertz (Hz).
It's important to note that the energy of a single photon can vary within a specific wavelength range, depending on the specific energy level of the photon. However, in terms of the maximum energy per individual photon, gamma rays have the highest energy among all types of photons.